I had this problem. I have a Uniden Dect 6.0. I changed my phone service from CenturyLink to Cox Cable. After a couple of months my red lite started flashing for no apparent reason. I discovered your post about how to fix it. To make a long story short, your fix didn’t work. So I checked to see if the phone package I have with Cox contained Voice Mail - IT DOES! So I called Cox and asked them how I could see all my phone serviced options and could I disable Voice Mail is it is part of my package and they sent me to a Cox website where I was able to disable their voice mail. I noticed, before I disabled it, that I had ONE (Cox Cable) voice mail. It’s been a week since I deleted the one voice mail and disabled the Cox Cable voice mail and I haven’t had the uncontrollable blinking red lite - that I should only have if someone left a message on my Uniden recorder.